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DemocritusLived: 460BC-370BCMain concepts: Everything is made of atoms Atoms are indivisible (cannot be divided) Atoms are small and solid particles Named the atom (called it “atomos”)
DaltonLived 1766-1844Main concepts: Each element has a different atom and a different atomic weight All atoms of the same element are perfectly identical Atoms cannot be created or destroyed in chemical reactions.
ThomsonLived: 1856-1940Main concepts: Discovered that atoms ARE divisible Discovered the electron through his Cathode-Ray experiment Atoms have a much larger mass than electrons Inferred that atoms have a positive charge Plum Pudding Model
RutherfordLived 1871-1937Discovered that there is a small, dense positively charged nucleusDiscovered that most of an atoms mass is in it’s nucleusPredicted the existence of neutronsStated that electrons move rapidly in the empty space around the nucleusConducted the gold foil experimentStated that atoms are mostly empty space.
BohrLived 1885-1962Stated that electrons can only travel at specific distances from the nucleusStated that electrons can jump between levels/paths around the nucleusStated that the chemical properties of an element are determined by how many electrons are in the outer shell.
ChadwickLived 1891-1974Discovered the previously unknown part of the nucleus of an atom- the Neutron!Named the neutron because of it’s lack of an electrical charge.His discovery made it possible to create new elements in the laboratory (heavier than Uranium) which was not possible before.
Electron Cloud ModelThis is our most modern and accepted model of the atomIt differs from Bohr’s model because it states that the electrons can be found in a general region around the nucleus, not specific paths.
Time for:The atom song!http://www.youtube.com/wat ch?v=vUzTQWn-wfE